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Bedrock topography of north-central Iowa

IMAP 1080

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Abstract

The bedrock in Iowa (Hershey, 1969) is generally overlain by deposits of glacial drift and alluvium, which range in thickness from less than 1 ft to more than 400 ft, and from less than 1 ft to about 60 ft respectively. The configuration of the bedrock surface is the result of a complex system of ancient drainage courses which were developed during a long period of preglacial erosion and during shorter, but mroe intense, periods of interglacial erosion.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Bedrock topography of north-central Iowa
Series title:
IMAP
Series number:
1080
Year Published:
1978
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Iowa Water Science Center
Description:
1 map : col. ;84 x 124 cm. on 2 sheets 97 x 78 cm.
Country:
United States
State:
Iowa
Scale:
25000
Online Only (Y/N):
N
Additional Online Files (Y/N):
N